There is professional type information for the care requirements of guinea pigs here:
https://grants.nih.gov/grants/olaw/Guide-for-the-Care-and-use-of-laboratory-animals.pdf .
It's titled "laboratory animals" but don't let that turn you off. Guinea pigs aren't farmed for food in the UK/US, the main professional use for them is in laboratories, so this is the context where their care requirements appear.
Organization is like:
Page 44 has temperature requirements (68F - 79F btw. Chickens are 61F - 81F for comparison).
Page 45 - 47 talks about ventilation and air quality - it's really important, these things are susceptible to fungal infections and can get upper respiratory infections.
Page 47 - 49 talks about illumination
Page 49 - 50, noise and vibration
Page 50 - 54, housing, environmental enrichment
Page 54 discusses outdoor housing but it does not mean to indicate that the temperature, airflow requirements, etc. are ignored in the case of outdoor housing.
Page 55 discusses space requirements. Page 57 specifies minimum space requirements for guinea pigs but if you do huge cuy, those minimums are out the window. Cuy are way too big for those specifications.
Page 65 is specific husbandry stuff. It discusses food and water through page 68 (critical: do not forget that guinea pigs need vitamin C in their food that other animals do not).
Page 68 starts bedding, then sanitation on page 69, note the footnote on page 71, section ends at page 77.
I recommend this book, "The Biology of the Guinea Pig", a lot of it you can read from Google Books:
https://books.google.fi/books?id=DcTaAgAAQBAJ
A little bit of what's in that book is not necessarily recommended practice now, such as utilizing kale as a "green", but a great deal of the information is valid.
Also worth noting - they are biologically so different from regular livestock that your typical neighborhood veterinarian cannot get things done with them. Guinea pigs require a specific "small animal" specialist veterinarian, and they are not that common. *Require* is the effective word. Some regular vets will decline to service guinea pigs, and for good reason, they know they do not have the right expertise and do not want to be the vet who makes your animal worse or kills it. Some of the differences are, like: most oral antibiotics kill guinea pigs by destroying their gut microbiome. They are sensitive to anesthesia. The strain of ringworm that infects guinea pigs does not show up with the usual inspections that work on cats and dogs (black light and so-on). My understanding is that getting blood from them is quite an affair and the humane way to do it is under anesthesia. There are multiple potential pitfalls for a regular veterinarian who attempts to work with guinea pigs.
So, it's an idea to research the locations of the small-animal specialist veterinarians (find more than one, you never know when one will be on vacation or sick). There's prescription medication they can prescribe to you to solve problems that you can't get anywhere else.